Electrical attachment plug



Nov. 24, 192 5- R; PENNINGTON ELECTRICAL ATTACHMENT PLUG Filed A rilzs. 1923 WINVEIN% Patented Nov. 24, 1925.

UNITED STATES I 1,563,105 PATENT OFFICE.

HARRY B. PENNINGTON, OF CHICAGO, ILLINOIS, ASSIGNOR TO JOHN A. A MOS, OF

ST. LOUIS, MISSOURI.

ELECTRICAL ATTACHMENT PLUG.

Application filed April 25, 1923. Serial No. 634,425.

ing is such a full, clear, and exact description as wlll enable anyone skilled in the art to which it appertains to make and, use the reference-being had to the accompanysame , forming part of this specificaing drawings,

tion. p

A variety of electrical devices, such as portable lights, heating units and devices operated by small motors, are commonly attached to electrical'circuits by means of attachment plugs and receptacles, and in order that a defect in one of these devices which would result in the blowing of the line fuse, may'not interrupt the service of other 1 electrical devices attached to the same circuit, it has been proposed to embody protective fuses in attachment plugs.

My invention relates to plugs of this type and itsobject is to simplify the construction,

and to provide means whereby renewable fuse strips may be employed, and readily inserted and removed, thus producing a smaller and less expensive plug than would be necessary if cartridge fuses were employed. In my improved plug the fuse chambers are formed by recesses in the insulating material of the plug.

In the accompanying drawings Figure 1 is a cross-sectional view, along the line 1-1 of Figure \2, of an attachment plug embody- 'ing my invention and shown installed in' a rotective metal casing which may or may not e employed; Figure 2 is a rear end view of the device shown in Figure 1; Figure 3 is a top plan view of the lower part of the plug; Figure 1 is a plan view showing the -nnder-surface of the upper part of the plug.

and is divided longitudinally into two parts,

1 and 2. Part 1 is provided with longitudinal recesses 3 and 4 separated by the-harrier 5, and in these recesses are secured fuse terminals 6 and 6. .Contact members 7 and 8 are also secured to the part 1, and in the form illustrated in the drawings these contact members are provided with extensions 9 forming fuse terminals Separation of the cooperating fuse terminals.

The plug casing is of insulating material the two parts of the plug gives access to the fuse chambers and permits the insertion or withdrawal of the fuse strips 10.

The other part 2 of the plug casing is provided with longitudinal recesses 3 and 4' conforming with the recesses in part 1, these recesses being separated by the barrier 5', which together with barrier 5 completely separates the fuse chambers when the parts are in assembled relation.

The part 2 of the casing carries resilient contact members l1, so proportioned and positioned that when the parts of the casing are brought together they press the ends of the fuses into good electrical contact with the fuse terminals 6 and 6', and the extensions 9 of the contact members 7 and 8, which in the particular construction shown form The parts of the plug are held together by the screw 12, and if desired the plug may be inserted in a protective metal casing 13 and held in position therein by the screw 14 passing through the plug as shown. The line wires are attached to the plug by means of the clamping screws 15:

It will be noted that my improved plug as described, comprises a structure in which blown fuses can be easily and cheaply re-' newed and one in which necessary size is not substantially increased by the incorporation offuses.

Having fully described my invention what I claim as new and desire'to secure by Letters Patent of the United States is:

1. An electrical attachment plug comprising a two part casing, one of which is provided with fuse terminals, a fuse, and resilient clamping means carried by the other part of the plug to hold the fuse in engagement with the terminals when the plug parts are in assembled relation.

2. An electrical attachment plug comprising a casing divided longitudinally into two parts, one of said parts being provided with a longitudinal recess on its inner face forming a fuse chamber, a renewable fuse strip and termina s therefor in said chamber, anda pair of resilient members carried bythe other part of the casing and positioned to extend into the fuse chamher and press the fuse strip into conductive engagement with the terminals when the casing parts are in assembled relation.

3. An electrical attachment plug comprising a casing of insulating material divided longitudinally into two parts, one of said parts being provided with longitudinal re- 5 cesses on its inner face forming fuse chambers and provided with fuse terminals and contact members, renewable fuse elements in said chambers, and resilient elements on the other part of the casing adapted to press the fuses into contact with the terminals and 10 Contacting members when the casing parts are in. assembled relation.

In testimony whereof, I have hereunto set my hand and aflixed my seal.

HARRY R. PENNlNGTON. a 5. 

